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Yes the point (pi/2, -4) is on the graph
Notice how in my work above I replaced x with pi/2 in the equation y = 3*cos(2x) - 1
Then I evaluated/simplified to get y = -4. So that confirms the equation works for x = pi/2

anonymous

2 years ago

oh so you just replaced it to check to see if the equation that we wrote was correct.. makes sense. :) Thank you lots!

jim_thompson5910

2 years ago

yes I recommend you check x = pi as well. Make sure that the output is y = 2

anonymous

2 years ago

Thanks again :) You're a life saver! I honestly had a lot of trouble with this problem